Serial numbers
Having trouble reading the numbers - seem to be the only place where there is rust.
The serial number appears to be a larger 3 then 445098
Below that serial is a number that is painted over and appears to be 1s 606.
There also appears to be another mark to the left of the 1s 606 (couldn't photo it as too faint) and it appears to ve 6806.
Well above the serial number is another mark, 4n. You can see that one in the very top of the first photo.